diff --git a/bin/ec2-cost b/bin/ec2-cost
index 3aa38e0a..a3f7ed05 100755
--- a/bin/ec2-cost
+++ b/bin/ec2-cost
@@ -18,6 +18,10 @@
 #    You should have received a copy of the GNU General Public License
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+# Exit immediately if this is not an Amazon EC2 instance, and we're not
+# in debug mode
+$(hostname | grep -qs "\.amazonaws\.com$") || [ -r "/tmp/ec2-cost-debug" ]
+[ "$?" = "0" ] || exit 0
 
 # Instance Cost Basis
 #			US		Europe